638271552 has 56 divisors (see below), whose sum is σ = 1690725600. Its totient is φ = 212509696.

The previous prime is 638271539. The next prime is 638271553. The reversal of 638271552 is 255172836.

It is a self number, because there is not a number n which added to its sum of digits gives 638271552.

It is not an unprimeable number, because it can be changed into a prime (638271553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246199 + ... + 248777.

Almost surely, 2^638271552 is an apocalyptic number.

It is an amenable number.

638271552 is an abundant number, since it is smaller than the sum of its proper divisors (1052454048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638271552 is a wasteful number, since it uses less digits than its factorization.

638271552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883 (or 3873 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 638271552 is about 25264.0367320822. The cubic root of 638271552 is about 860.9973789952.

The spelling of 638271552 in words is "six hundred thirty-eight million, two hundred seventy-one thousand, five hundred fifty-two".